code: def __len__(self):
      return len(self.images_path)
  
file_path: deep-learning-for-image-processing/pytorch_segmentation/u2net/my_dataset.py
imports: import os
  import cv2
  import torch.utils.data
label_desc: Use image node_id 3 for calling the DUTSDataset obj's underlying member method code with example usage: obj.__len__() and returns: len